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I think Poli is definitely a master in colour combination. With some pieces I have extreme trouble knowing whether it is one or two colours. He blends colour so well! I think the A.S sommerso pieces are definitely A.S. Good colour combination but you can tell the distinct layers.

I will be unwrapping (Xmas has come early :chky:) a few other sommerso pieces which are of good quality this weekend. Pic time! And these are pieces i am unsure about!

One colour would be straightforward clear cased. For Sommerso you always need two or more, by definition. You cannot "merge" colours by superimposing - either by dipping or by wrapping it around the core. In Sommerso you will always see at least two boundaries.

I have a huge Cenedese vase which is blue cased in Neodymium - you'd think that is sommerso. But technically speaking it is not. I noticed on the Artofvenice site that they have the definition right - but still will describe some pieces as Sommerso even if it only single cased. Maybe if they see this they will be so kind as to clear up the issue. It may well be a case of stretched definitions - and I'm not sure local glassmakers always follow the correct definition either.

Heiremans lumps sommerso and cased glass, as well as glass with inclusions, into a single chapter "Sommerso" in his book Murano Glass, Themes and Variations. He defines sommerso as glass made that has two or more layers made by dipping an object into glass (paraphrased). Thinking of the thinly cased vessels made by Martinuzzi, I have difficult stretching my definition of sommerso to include them. They don't look submerged to me. In fact, they barely look cased. Perhaps Heiremans included cased vessels in this chapter because it is a manner of the degree in thickness of the layers. He did not write of why he had lumped these vessels together.